Process capability compares the output of an in-control process to the specification limits by using capability indices. The comparison is made by forming the ratio of the spread between the process specifications (the specification “width”) to the spread of the process values, as measured by 6 process standard deviation units (the process “width”).
Process Capability Measurement (PCM)
A process capability index uses both the process variability and the process specifications to determine whether the process is “capable”
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